diff -ur /root/src/kvm-kmod-3.3/external-module-compat.c kvm-kmod-3.3/external-module-compat.c
--- /root/src/kvm-kmod-3.3/external-module-compat.c	2012-03-20 06:00:42.000000000 +0800
+++ kvm-kmod-3.3/external-module-compat.c	2012-04-16 16:18:55.111812633 +0800
@@ -267,7 +267,7 @@
 
 #endif /* CONFIG_USER_RETURN_NOTIFIER */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 
 #include <linux/kvm_host.h>
 
diff -ur /root/src/kvm-kmod-3.3/external-module-compat-comm.h kvm-kmod-3.3/external-module-compat-comm.h
--- /root/src/kvm-kmod-3.3/external-module-compat-comm.h	2012-03-20 06:00:42.000000000 +0800
+++ kvm-kmod-3.3/external-module-compat-comm.h	2012-04-16 20:01:13.426968264 +0800
@@ -203,7 +203,8 @@
 
 #endif
 
-#ifdef KVM_NEED_PAGEFAULT_DISABLE
+#if 0 
+def KVM_NEED_PAGEFAULT_DISABLE
 
 static inline void pagefault_disable(void)
 {
@@ -271,7 +272,7 @@
 
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
 
 #include <linux/mm.h>
 
@@ -447,7 +448,8 @@
 #define marker_synchronize_unregister() synchronize_sched()
 #endif
 
-#ifdef NEED_COMPOUND_HEAD
+#if 0 
+def NEED_COMPOUND_HEAD
 
 static inline struct page *compound_head(struct page *page)
 {
@@ -482,7 +484,7 @@
 
 #include <linux/tracepoint.h>
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
 
 struct tracepoint;
 
@@ -656,7 +658,7 @@
 
 #endif /* CONFIG_USER_RETURN_NOTIFIER */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
 
 #ifdef CONFIG_SMP
 void kvm_synchronize_srcu_expedited(struct srcu_struct *sp);
@@ -718,8 +720,10 @@
 #endif
 }
 
-#if defined(CONFIG_PCI) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33) && \
+#if 0 
+/*defined(CONFIG_PCI) && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33) && \
     (!defined(CONFIG_SUSE_KERNEL) || LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32))
+*/
 #include <linux/pci.h>
 static inline struct pci_dev *
 pci_get_domain_bus_and_slot(int domain, unsigned int bus, unsigned int devfn)
@@ -743,7 +747,7 @@
 
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
 struct perf_guest_info_callbacks {
 	int (*is_in_guest) (void);
 	int (*is_user_mode) (void);
@@ -821,7 +825,7 @@
 #define lower_32_bits(n) ((u32)(n))
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 #define EHWPOISON	133	/* Memory page has hardware error */
 #define FOLL_HWPOISON	0x100	/* check page is hwpoisoned */
 
@@ -873,7 +877,7 @@
 
 /* Services below are only referenced by code unused in older kernels */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)
 static inline void kvm_use_mm(struct mm_struct *mm)
 {
 	BUG();
@@ -901,11 +905,13 @@
 #define __rcu
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) && \
+#if 0 
+/*LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) && \
     (!defined(CONFIG_FEDORA_KERNEL) || \
      (LINUX_VERSION_CODE == KERNEL_VERSION(2,6,35) && \
       KERNEL_EXTRAVERSION < 11) || \
      LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35))
+*/
 #include <linux/vmalloc.h>
 static inline void *vzalloc(unsigned long size)
 {
@@ -932,7 +938,7 @@
 #define kvm_request_threaded_irq	request_threaded_irq
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38)
 #define compound_trans_head(page) compound_head(page)
 
 static inline int PageTransCompound(struct page *page)
@@ -949,7 +955,7 @@
 #define kvm___this_cpu_write		__this_cpu_write
 #endif /* > 2.6.33 */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 #define kvm_get_task_pid(t, pt)	(t)->pids[pt].pid
 #define kvm_put_pid(p)		p = p
 #else /* >= 2.6.39 */
@@ -984,7 +990,7 @@
 #define __set_bit_le	ext2_set_bit
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(3,0,0)
 static inline void rcu_virt_note_context_switch(int cpu)
 {
 }
@@ -1008,9 +1014,9 @@
 #endif /* >= 3.1 */
 #endif /* CONFIG_COMPAT */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
 
-#ifdef CONFIG_PRINTK
+#if def CONFIG_PRINTK
 #define printk_ratelimited(fmt, ...)					\
 ({									\
 	static DEFINE_RATELIMIT_STATE(_rs,				\
@@ -1043,7 +1049,7 @@
 
 #endif /* < 2.6.35 */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0)
 static inline int kvm_sched_info_on(void)
 {
 #ifdef CONFIG_SCHEDSTATS
diff -ur /root/src/kvm-kmod-3.3/srcu.c kvm-kmod-3.3/srcu.c
--- /root/src/kvm-kmod-3.3/srcu.c	2012-03-20 06:00:42.000000000 +0800
+++ kvm-kmod-3.3/srcu.c	2012-04-16 14:47:28.509802286 +0800
@@ -35,7 +35,8 @@
 #include <linux/srcu.h>
 #include <linux/kthread.h>
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33) && defined(CONFIG_SMP)
+#if 0 
+LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33) && defined(CONFIG_SMP)
 
 /*
  * srcu_readers_active_idx -- returns approximate number of readers
diff -ur /root/src/kvm-kmod-3.3/x86/compat-x86.c kvm-kmod-3.3/x86/compat-x86.c
--- /root/src/kvm-kmod-3.3/x86/compat-x86.c	2012-03-20 06:00:42.000000000 +0800
+++ kvm-kmod-3.3/x86/compat-x86.c	2012-04-16 16:16:43.722802282 +0800
@@ -1,5 +1,5 @@
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
 
 unsigned int kvm_xstate_size;
 
diff -ur /root/src/kvm-kmod-3.3/x86/eventfd.c kvm-kmod-3.3/x86/eventfd.c
--- /root/src/kvm-kmod-3.3/x86/eventfd.c	2012-03-20 06:00:56.000000000 +0800
+++ kvm-kmod-3.3/x86/eventfd.c	2012-04-16 15:08:31.192719176 +0800
@@ -77,7 +77,6 @@
  * --------------------------------------------------------------------
  */
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
 struct _irqfd {
 	/* Used for MSI fast-path */
 	struct kvm *kvm;
@@ -690,12 +689,3 @@
 
 	return kvm_assign_ioeventfd(kvm, args);
 }
-#else
-void kvm_eventfd_init(struct kvm *kvm) { }
-void kvm_irqfd_release(struct kvm *kvm) { }
-void kvm_irq_routing_update(struct kvm *kvm,
-                            struct kvm_irq_routing_table *irq_rt)
-{
-	rcu_assign_pointer(kvm->irq_routing, irq_rt);
-}
-#endif
diff -ur /root/src/kvm-kmod-3.3/x86/external-module-compat.h kvm-kmod-3.3/x86/external-module-compat.h
--- /root/src/kvm-kmod-3.3/x86/external-module-compat.h	2012-03-20 06:00:42.000000000 +0800
+++ kvm-kmod-3.3/x86/external-module-compat.h	2012-04-16 16:49:11.880968642 +0800
@@ -852,7 +852,8 @@
 #define percpu_write(t, v)	__get_cpu_var(t) = v
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32) || \
+#if 0 
+LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32) || \
     (LINUX_VERSION_CODE == KERNEL_VERSION(2,6,32) && \
      KERNEL_EXTRAVERSION < 16) || \
     (LINUX_VERSION_CODE == KERNEL_VERSION(2,6,33) && \
@@ -865,7 +866,7 @@
 #define KVM_TBOOT_ENABLED_WORKS	1
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
 struct kvm_pvclock_vcpu_time_info {
 	u32   version;
 	u32   pad0;
@@ -890,7 +891,7 @@
 
 #include <asm/i387.h>
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
 struct kvm_i387_fxsave_struct {
 	u16	cwd;
 	u16	swd;
@@ -936,7 +937,7 @@
 
 #endif /* >= 2.6.35 */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
 
 struct kvm_compat_fpu {
 	union kvm_thread_xstate state_buffer;
@@ -1039,7 +1040,7 @@
 #define XSAVE_HDR_OFFSET    512
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
 #define kvm_cpu_has_xsave	0
 #else /* >= 2.6.28 */
 #define kvm_cpu_has_xsave	cpu_has_xsave
@@ -1115,8 +1116,10 @@
 
 #endif /* >= 2.6.36 */
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) && \
+#if 0 
+/*LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) && \
     (LINUX_VERSION_CODE != KERNEL_VERSION(2,6,32) || KERNEL_EXTRAVERSION < 40)
+*/
 static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift)
 {
 	u64 product;
@@ -1173,7 +1176,7 @@
 	asm("mov %%" #seg ",%0":"=r" (value) : : "memory")
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
 #define static_cpu_has(bit) boot_cpu_has(bit)
 #endif
 
@@ -1237,7 +1240,7 @@
 #define X86_PMC_MAX_FIXED					3
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35)
 union kvm_cpuid10_eax {
 	struct {
 		unsigned int version_id:8;
@@ -1251,7 +1254,7 @@
 #define kvm_cpuid10_eax	cpuid10_eax
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+#if 0 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
 union kvm_cpuid10_edx {
 	struct {
 		unsigned int num_counters_fixed:5;
diff -ur /root/src/kvm-kmod-3.3/x86/kvm_main.c kvm-kmod-3.3/x86/kvm_main.c
--- /root/src/kvm-kmod-3.3/x86/kvm_main.c	2012-03-20 06:00:56.000000000 +0800
+++ kvm-kmod-3.3/x86/kvm_main.c	2012-04-16 20:00:20.673075540 +0800
@@ -427,7 +427,7 @@
 	return young;
 }
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38)
+#if 1 
 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
 				       struct mm_struct *mm,
 				       unsigned long address)
@@ -461,7 +461,7 @@
 	.invalidate_range_start	= kvm_mmu_notifier_invalidate_range_start,
 	.invalidate_range_end	= kvm_mmu_notifier_invalidate_range_end,
 	.clear_flush_young	= kvm_mmu_notifier_clear_flush_young,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38)
+#if 1
 	.test_young		= kvm_mmu_notifier_test_young,
 #endif
 #ifdef MMU_NOTIFIER_HAS_CHANGE_PTE
@@ -1155,8 +1155,11 @@
 
 	if (write)
 		flags |= FOLL_WRITE;
-
+#if 0
 	return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
+#else
+        return __get_user_pages(tsk, mm, start, 1, flags, page, NULL);
+#endif
 }
 
 static inline int check_user_page_hwpoison(unsigned long addr)
@@ -1164,7 +1167,11 @@
 	int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
 
 	rc = __get_user_pages(current, current->mm, addr, 1,
+#if 0
 			      flags, NULL, NULL, NULL);
+#else
+                              flags, NULL, NULL);
+#endif
 	return rc == -EHWPOISON;
 }
 
@@ -1269,7 +1276,7 @@
 		return page_to_pfn(bad_page);
 	}
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
+#if 1 //LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39)
 	async = NULL;
 #endif
 	return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
@@ -1637,7 +1644,7 @@
 }
 EXPORT_SYMBOL_GPL(kvm_resched);
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
+#if 1 //LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
 {
 	struct kvm *kvm = me->kvm;
@@ -2125,7 +2132,7 @@
 		break;
 	}
 #endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
+#if 1
 	case KVM_IRQFD: {
 		struct kvm_irqfd data;
 
@@ -2136,7 +2143,7 @@
 		break;
 	}
 #endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
+#if 1 
 	case KVM_IOEVENTFD: {
 		struct kvm_ioeventfd data;
 
@@ -2455,18 +2462,10 @@
 		       cpu);
 		hardware_disable(NULL);
 		break;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28)
 	case CPU_STARTING:
-#else
-	case CPU_ONLINE:
-#endif
 		printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
 		       cpu);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28)
 		hardware_enable(NULL);
-#else
-		smp_call_function_single(cpu, hardware_enable, NULL, 1);
-#endif
 		break;
 	}
 	return NOTIFY_OK;
diff -ur /root/src/kvm-kmod-3.3/x86/mmu.c kvm-kmod-3.3/x86/mmu.c
--- /root/src/kvm-kmod-3.3/x86/mmu.c	2012-03-20 06:00:56.000000000 +0800
+++ kvm-kmod-3.3/x86/mmu.c	2012-04-14 16:58:31.103842804 +0800
@@ -3939,9 +3939,9 @@
 	kvm_mmu_prepare_zap_page(kvm, page, invalid_list);
 }
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,0)
+#if 0 //LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,0)
 static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc)
-#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
+#elif 1 //LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35)
 static int mmu_shrink(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
 #else
 static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask)
diff -ur /root/src/kvm-kmod-3.3/x86/x86.c kvm-kmod-3.3/x86/x86.c
--- /root/src/kvm-kmod-3.3/x86/x86.c	2012-03-20 06:00:56.000000000 +0800
+++ kvm-kmod-3.3/x86/x86.c	2012-04-16 16:01:17.944050813 +0800
@@ -122,11 +122,8 @@
 struct kvm_x86_ops *kvm_x86_ops;
 EXPORT_SYMBOL_GPL(kvm_x86_ops);
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)
-static int ignore_msrs = 0;
-#else
 static bool ignore_msrs = 0;
-#endif
+
 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
 
 bool kvm_has_tsc_control;
@@ -2102,10 +2099,8 @@
 	case KVM_CAP_REINJECT_CONTROL:
 	case KVM_CAP_IRQ_INJECT_STATUS:
 	case KVM_CAP_ASSIGN_DEV_IRQ:
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
 	case KVM_CAP_IRQFD:
 	case KVM_CAP_IOEVENTFD:
-#endif
 	case KVM_CAP_PIT2:
 	case KVM_CAP_PIT_STATE2:
 	case KVM_CAP_SET_IDENTITY_MAP_ADDR:
@@ -2119,9 +2114,7 @@
 	case KVM_CAP_DEBUGREGS:
 	case KVM_CAP_X86_ROBUST_SINGLESTEP:
 	case KVM_CAP_XSAVE:
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
 	case KVM_CAP_ASYNC_PF:
-#endif
 	case KVM_CAP_GET_TSC_KHZ:
 		r = 1;
 		break;